<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>垂直手风琴</title>
    <style>
        .accordionMenu{
            color: #424242;
            font: 12px Arial, Verdana, sans-serif;
            margin: 0 auto;
            padding: 10px;
            width: 500px;
        }
        .accordionMenu h2{
            margin: 5px 0;
            padding: 0;
            position: relative;
        }
        .accordionMenu h2:before {/* 制作向下三角效果*/
            border: 5px solid #fff;
            border-color: #fff transparent transparent;
            content:"";
            height: 0;
            position:absolute;
            right: 10px;
            top: 15px;
            width: 0;
        }
        .accordionMenu h2 a{
            background: #8f8f8f;
            background: -webkit-gradient(linear,left top,left bottom,
            from(#cecece),to(#8f8f8f));
            background: -webkit-gradient(top,#cecece,#8f8f8f);
            background: -moz-linear-gradient(top,#cecece,#8f8f8f);
            background: -webkit-linear-gradient(top,#cecece,#8f8f8f);
            background: -o-linear-gradient(top,#cecece,#8f8f8f);
            border-radius: 5px;
            color: #424242;
            display: block;
            font-size: 13px;
            font-weight: normal;
            margin: 0;
            padding: 10px 10px;
            text-shadow: 2px 2px 2px #aeaeae;
            text-decoration: none;
        }
        .accordionMenu :target h2 a,/* 目标标题的效果*/
        .accordionMenu h2 a:focus,
        .accordionMenu h2 a:hover,
        .accordionMenu h2 a:active{
            background: #2288dd;
            background: -moz-linear-gradient(top,#6bb2ff,#2288dd);
            background: -webkit-gradient(linear,left top,left bottom,
            form(#6bb2ff)to(#2288dd));
            background: -webkit-linear-gradient( top, #6bb2ff, #2288dd);
            background: -o-linear-gradient( top, #6bb2ff, #2288dd);
            background: linear-gradient( top, #6bb2ff, #2288dd);
            color: #ffffff;
        }
        .accordionMenu p {/* 标题栏对应的内容*/
            margin:0;
            height: 0;/* 默认栏目内容高度为0，达到隐藏效果*/
            overflow: hidden;
            padding:0 10px;
            -moz-transition: height 0.5s ease-in;
            -webkit-transition: height 0.5s ease-in;
            -o-transition: height 0.5s ease-in;
            transition: height 0.5s ease-in;
        }
        /* 这部分是显示内容的关键代码*/
        .accordionMenu :target p {/* 展开对应目标内容*/
            height:100px;/* 显示对应目标栏内容*/
            overflow: auto;
        }
        .accordionMenu :target h2:before {/* 展开时标题三角效果*/
            border-color:transparent transparent transparent #fff;
        }
    </style>
</head>
<body>
<div class="accordionMenu">
    <div class="menuSection" id="brand">
        <h2><a href="#brand">Brand</a></h2>
        <p>Lorem ipsum dolor...</p>
    </div>
    <div class="menuSection" id="promotion">
        <h2><a href="#promotion">Promotion</a></h2>
        <p>Lorem ipsum dolor sit amet...</p>
    </div>
    <div class="menuSection" id="event">
        <h2><a href="#event">Event</a></h2>
        <p>Lorem ipsum dolor sit amet...</p>
    </div>
</div>
</body>
</html>